Method for indicating the termination of a yarn cake winding



. March 4, 1958 H.-P. FRY, JR

METHOD FOR INDICATING THE TERMINATION OF A YARN CAKE WINDING Filed Nov.29, 1954 w'w u iag United rates Faterrt METHUD FER EJDKCATRIG THETERMINATION F A YARN CAKE VJINDING Horace 1. Fry, a., West Chester, Pa,assignor to American Viscose Corporation, Philadelphia, Pa., 2corporation of Delaware Application November 29, 1954, Serial No.471,833

3 Claims. (Cl. 18-54) This invention relates to a method of selectivelyeliminating the innermost layers of a cake or package of syntheticfilament and more particularly to the provision or" controlled slugs inthe filament as it is produced at the spinning machine.

When artificial filaments are produced on the boxtype spinning machine,the yarn strand, after being properly treated and washed, is spun intocakes in the conventional spinning pots. These cakes, when completed,are individually removed from the pots and then subjected to furtherliquid treatment and drying after which the yarn is unwound from thecakes and in turn wound on bobbins, cones, beams or other suitablemandrels in accordance with the customers needs. I have found that inthe process of handling and treating the cakes from the time they areremoved from the spinning pots to the time when they are wound ontocones or bobbins, the inner layers of windings of the cakes arefrequently damaged so that it may be impossible or impractical to use upthese damaged layers or windings. Such damage may occur from the actualmanual manipulation of the cakes or it may result from damage due to theinsertion of rods or mandrels through the cakes in the course of variousprocessing and drying steps.

The present invention has for its primary object the provision of amethod for imparting structural changes into filaments during thespinning of the same.

A further object of the invention is to provide a method for inducingslubs or spurts of spinning fluid through the spinneret which in turnform bumps or slubs on the yarn so that the winding machines willautomatically stop due to actuation of the slub catcher.

A further object of the invention is to provide a method of inducingslubs in the extruded yarn filaments when a yarn cake has beensubstantially completed.

A further object of the invention is to provide a method for eliminatingthe damaged turns adjacent the bore of a yarn package.

Further objects will be apparent from the specification and drawings inwhich:

Figure 1 is a fragmentary detail of a spinning machine partly schematicshowing a preferred embodiment of the present invention;

Figure 2 is a transverse section as seen at 11-11 of Figure 1;

Figure 3 illustrates a modified form of the apparatus of Figure l; and

Figure 4 shows the introduction of the slubs to the final windings of ayarn cake.

The invention comprises essentially the provision of acceleratinginstantaneously the speed of the pump shaft on the spinning machine toinduce a series of slubs in the yarn at a predetermined time before eachcake is completed. When the yarn in the cake is being unwound in thebeaming machine or other winding machine, the slubs which occur near thelast internal windings of the cake actuate the slub catching device onthe winding machine, thus automatically interrupting further winding andpermitting the operator to remove the cake before any damaged orinferior windings are transferred from the cake onto the cone or beam.

, Referring more particularly to the drawings, apparams for practicingthe method of the present invention is shown in Figures 1 and 2 andcomprises an auxiliary drive for the main pump shaft 10. In normaloperation, the drive for the metering pump 11 is through shaft 10, spurgears 12 and 13 to shaft 14. From thence the pump 11 is driven throughmating spur gears 15 and 16. Viscose is thereby pumped through conduit17 to filter 18 and spinneret 19 positioned in the conventionalcoagulating bath 2%. When the cake C is nearly completed, the operatorintentionally produces slubs S, S in the yarn by engaging clutch 25through actuation of lever 26. This operation transfers the drivingconnection to shaft 27 journaled at 28, 28 thence through eiipticalgears 29 and 30 to shaft 14. The minimum pitch diameter of gear 313 isequal to or greater than the pitch diameter of gear 12 so that a cyclicincrease in rotational speed is imparted to shaft 14 in accordance withthe contour of gears 2? and 30. Since gears 12 and 13 are in constantmesh, I provide an over-running clutch 31 of any conventional variety sothat, although gears 12 and 13 turn at constant speed to turn shaft 14through the clutch 31, they are not effective to turn shaft 14 whengears 29 and 313 are engaged.

It will thus be understood that for every revolution of elliptical gear30, two shots or slugs of viscose are injected through spinneret 19 byreason of the increased rotational speed of shaft 14. This in turnprovides the slubs S, S in the yarn. As shown in Figure 4, these slubsare positioned at the portion of the yarn which is located sulficientlyradially inward from the bore of the cake to have escaped any possibledamage in processing. When the slubs or the first one of them reachesthe slub catcher in the winding machine, the stop motion deviceautomatically stops the machine so that there is no danger of windingany damaged yarn onto the cone or beam as the case may be.

The apparatus of Figures 1 and 2 is semi-automatic in that the operatorneed only throw lever 26 to induce the slubs in the yarn. The slubswill, of course, continue to be spun until clutch 25 is disengaged. Thesame result can be achieved in a complete manual operation with theapparatus shown in Figure 3. In this construction the main driveshaft 10operates the pump 11 through gears 12, 13 and 15, 16 as described inconnection with Figure 1. However, instead of intermittently increasingthe speed of shaft 14 through the medium of elliptical gears, a ratchet35 is keyed to the shaft 14 on the other side of over-running clutch 31.A lever 36 is pivotally mounted on shaft 14 and straddles ratchet 35.Pawl 37 connects lever 36 with the ratchet so that the operator canintermittently increase the speed of shaft 14 by actuating the lever 36back and forth. Engagement between pawl 37 and ratchet 35 transmitstorque from the lever to the shaft in the direction of rotation of shaft14 so that the speed of the shaft and, consequently, the pump isincreased to produce the slubs in the same manner as describedpreviously.

The present invention provides a simple and satisfactory manner forautomatically inducing slubs at the desired position in the extrudedyarn, and it will be understood that the apparatus can be made fullyautomatic provided the time required to spin the desired amount ofslub-free yarn is known.

Having thus described my invention, I claim:

1. The method of providing a yarn cake with structut-a1 means for useintindicating the termination ofha yarn cake winding including the stepsof extruding a filament-forming material through a spinneret at asubstantially v:uniform rate,tcollecting-the extruded filament as.:a"continuous yarn in :wound cake form, warying the fiowcoffilament-forming rnaterials throughathe vspinneret at intermittentintervals as the termination .of the cake winding is approached, andcontinuing theintermittently varying flow:offilament-forming materialthrough the spinneret until :the final yarn cake windings are completed.

'2. The method .of providing a yarn cake with structuraltmeans for-.usein indicating the stermination of a yarn tcaket winding including thesteps of :extruding a filament-forming material through a spinneret :ata :substantiallynniform rate, 1 collecting the extruded filament asa-;continuoussyarn-in wound cake form, increasing the flow offilament-forming material throughz-the spinneret at intermittentintervals as the termination-of the cake winding approached; andcontinuing :the intermittently increased flow of filament-formingmaterial through the aspinneret until the final yam cake windings arecompleted.

3. The method of providing a yarn cake with structural means for use inindicating the termination of a yarn cake Winding including the steps ofextruding a filament-forming material through a spinneret at asubstantially uniform rate, collecting the extruded filament as acontinuous yarn in a wound cake form, altering the cross-sectional shapeof the extruded filament at intermittent "intervals along its length asthe termination of the yarn cake winding is approached, .and continuingthe intermittent alteration of the filament cross-sectional shape pntilthe final yarn cake-windings are completed.

References 1Ci te d inthe-fileof this patent UNITED STATES PATENTS2,517,946 Kohorn Aug. 48, 1950 "2,624,070 '-Mc Dermo tt Jan. 6,49532,671,929 Gaylord Mar. '16, 1954- 2,'7'12,489 Abbott July 5, 1955

1. THE METHOD OF PROVIDING A YARN CAKE WITH STRUCTURAL MEANS FOR USE ININDICATING THE TERMINATION OF A YARN CAKE WINDING INCLUDING THE STEPS OFEXTRUDING A FILAMENT-FORMING MATERIAL THROUGH A SPINNERET AT ASUBSTANTIALLY UNIFORM RATE, COLLECTING THE EXTRUDED FILAMENT AS ACONTINUOUS YARN IN WOUND CAKE FROM, VARYING THE FLOW OF FILAMENT-FORMINGMATERIALS THROUGH THE SPINNERET AT INTERMITTENT INTERVALS AS THETERMINATION OF THE CAKE WINDING IS APPROACHED, AND CONTINUING THEINTERMITTENTLY VARYING FLOW OF FILAMENT-FORMING MATERIAL THROUGH THESPINNERET UNTIL THE FINAL YARM CAKE WINDINGS ARE COMPLETED.